Definition of hexaploid in US English:



  • 1(of a cell or nucleus) containing six homologous sets of chromosomes.

    • ‘However, even with the large size of this hexaploid genome, the genes within the three component genomes remain largely colinear.’
    • ‘There is a high degree of colinearity among hexaploid wheat chromosomes within each of the seven homoeologous groups.’
    • ‘For example, Devos and Gale used the term ‘genome’ to refer to both the entire complement of nuclear DNA in a hexaploid wheat nucleus and to the individual A, B and D ‘genomes’.’
    • ‘The hexaploid wheat genome is composed of three related diploid genomes designated A, B, and D with seven chromosomes each.’
    • ‘In all three polyploids, the respective tetraploid and hexaploid genome sizes are slightly larger than the corresponding multiple of the diploid subsp. glaucum.’
    1. 1.1 (of an organism or species) composed of hexaploid cells.
      • ‘Recent molecular data indicate differences in molecular chromosome organization among the genomes of diploid, tetraploid, and hexaploid wheat.’
      • ‘Our genetic analysis detected some aberrations, such as the presence of four hexaploid offspring in the progeny study.’
      • ‘The observed segmental structure of the Brassica genome strongly suggests that the extant Brassica diploid species evolved from a hexaploid ancestor.’
      • ‘Together with other Brassica species, it likely descends from a hexaploid ancestor followed by extensive rearrangements, making its genome essentially a triplicated A. thaliana genome.’
      • ‘Because the present study analysed only one accession in each hexaploid species, it is not known whether these variations are species-specific or not.’


  • A hexaploid organism, variety, or species.

    • ‘It is a hexaploid that is thought to be produced by two sequential hybridization events.’
    • ‘Both parents and all the progenies are hexaploids, as shown twice using flow cytometry.’
    • ‘LAGERCRANTZ 1998 suggested that the base diploid Brassica genome evolved from an ancient hexaploid with three highly rearranged A. thaliana-like genomes.’
    • ‘Cytological variation of R. japonica var. japonica in its native regions is high and includes tetraploids, hexaploids, octoploids and decaploids.’
    • ‘By 1939, after seven years’ work with repeated crossing of hexaploids and octoploids, a German scientist, Müntzing, was getting promising results, and by 1950 he had produced plants with 90% of the yield of wheat.’